Engine Performance problem
2002 Chevy Tahoe V8 Four Wheel Drive Automatic 105000 miles
check engine light come on and off sproadically. Engine idles @ 500 rpm very roughly when in drive but otherwise runs smooth at speed. Happens when in drive when at stop with brakes applied. Seems to surge and buck. Codes that come up on diagnostic are 171 and 174, lean left and right bank. First check was to check and clean MAF sensor. After that codes suggest oxygen sensor or possibly fuel pressure regulator. Engine runs smooth after reaching operating temp.
Tuesday, December 29th, 2009 AT 6:53 PM